text: The fourth shell includes programs on representation theory of space and point groups. [http://www.cryst.ehu.es/rep/repres.html REPRES] constructs little group and full group irreducible representations for a given space group and a k-vector; [http://www.cryst.ehu.es/rep/correl.html CORREL] deals with the correlations between the irreducible representations of group-subgroup related space groups. The program [http://www.cryst.ehu.es/rep/point.html POINT] lists character tables of crystallographic point groups, Kronecker multiplication tables of their irreducible representations and further useful symmetry information.